Description

Practice more problem-solving at https://brilliant.org/TedEd/
Solution to bonus riddle: https://brilliant.org/TedEdTimeTravel/

Your professor has accidentally stepped through a time portal in his physics lab. You’ve got just a minute to jump through before it closes and leaves him stranded in history. Your only way back is to grab enough colored nodules to create a new portal to open a doorway through time. Can you take the right amount of nodules to get back to the present before the portal closes? Dan Finkel shows how.